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r _ <br /> t' <br /> Clayton <br /> I%�N Nr.;f�t. <br /> cups i.twts <br /> Ms. Laurie Cotulla <br /> June 11, 1990 <br /> Fage 4 <br /> TASI� ? - SOIL EXCAVATION <br /> Clayton proposes to excavate soils togroundwater in the vicinity of the former UST <br /> and MW-3 (Figure 2). The excavation process will be supervised by a Claytran <br /> geologist er environmental engineer. We estimate excavation of about 300 cubic <br /> yards of soil. Operations will be monitored with an orgar.iic vapor meter (OVM) to <br /> assure that all contaminated soils are excavated. Confirmation samples will be <br /> collected from the excavation walls and analyzed by the fol,owing Environmental <br /> Protection Agency (EPA) methods: <br /> EPA Method 5030/8015-5020, for TPH as gasoline and BTEX <br /> .EPA Method 418.1, for total recoverable hydrocarbons and oil and grease <br /> • TASK 3 - SOIL AERATION <br /> Aeration of contaminated soils will be accomplished by spreading the soils in a thin <br /> layer (approximately six inches thick) on a o! <br /> soils. To remain in compliance with the Air PollutionrDiistrictner tguidelines,rotects face <br /> f <br /> maximum of 300 cubic yards of soil will be aerated per day, <br /> As a safety measure, the excavation area will be temporarily fenced and the walls <br /> of the excavation will be sloped. <br /> TASK 4 SOIL AEPUTION AND MONITORING <br /> The excavated soils will be periodically rototilled to expose additional soils to <br /> aeration. One discrete confirmation sample for each 25 yd'of aerated soil will be <br /> f collected and analyzed for the contaminants previously noted. Pending approval of <br /> your agency and the Regional Board, the remediated sail will be backfilled in the <br /> Excavated hole and compacted. A new monitoring well will be placed in a corner of <br /> 4' the excavation for future monitorin'o' baseline environmental conditions. This <br /> well will be resurveyed by a licensed land surveyor. <br /> • TASK 5 -FINAL REPORTING - <br /> - <br /> Upon completion of the project, Clayton will prepare a report summarizing the <br /> findings: This report will include site activities, background soil sampling and <br /> laboratory analysis, and our conclusions and recommendationF. " <br /> t <br /> E <br /> i <br /> i <br /> s <br /> c . <br /> F <br /> { <br /> :L — <br />